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Optimized Absorption Performance of FeSiCr Nanoparticles by Changing the Shape Anisotropy
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-10-09 , DOI: 10.1002/pssa.202000389 Yang Chen 1 , Lei Wang 1, 2, 3, 4 , Houdong Xiong 1 , Sajjad Ur Rehman 1 , Qiulan Tan 1 , Qingfang Huang 1, 4 , Zhenchen Zhong 1
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-10-09 , DOI: 10.1002/pssa.202000389 Yang Chen 1 , Lei Wang 1, 2, 3, 4 , Houdong Xiong 1 , Sajjad Ur Rehman 1 , Qiulan Tan 1 , Qingfang Huang 1, 4 , Zhenchen Zhong 1
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FeSiCr nanoparticles are prepared by plasma arc discharge and ball milling processes. After ball milling, the surface area and sizes of the FeSiCr nanoparticles become larger, and most of the nanoparticles become uneven. The increasing surface area and sizes of nanoparticles contribute to the electrical conductivity, enhance the space charge polarization between metal ions, and increase the shape anisotropy of FeSiCr nanoparticles. The inhomogeneity of nanoparticles reduces the activation energy ( ) of the FeSiCr nanoparticles. Therefore, the complex permittivity ( ) is improved, and the impedance matching is optimized. The minimum reflection loss (RLmin) of FeSiCr nanoparticles after ball milling for 6 h reaches −41.5 dB at 6.2 GHz and the effective absorbing bandwidth (RL < −10 dB) improves from 4.5 to 8.1 GHz (d = 2.2 mm). The RLmin of FeSiCr nanoparticles after ball milling for 4 h is −40.1 dB at 6.9 GHz, which is slightly less than that of the sample after ball milling for 6 h, whereas the effective absorption bandwidth (RL < −10 dB) is from 5.8 to 9.0 GHz (d = 2.2 mm). It shows that the absorption performance of FeSiCr nanoparticles can be improved by changing the shape anisotropy.
中文翻译：
通过改变形状各向异性优化FeSiCr纳米粒子的吸收性能
FeSiCr纳米颗粒通过等离子弧放电和球磨工艺制备。球磨后，FeSiCr纳米颗粒的表面积和尺寸变大，并且大多数纳米颗粒变得不均匀。纳米颗粒表面积和尺寸的增加有助于提高导电性，增强金属离子之间的空间电荷极化，并增加FeSiCr纳米颗粒的形状各向异性。纳米粒子的不均匀性降低了活化能（FeSiCr纳米粒子）。因此，复介电常数（）进行了改进，并且阻抗匹配得到了优化。球磨6 h后，FeSiCr纳米颗粒的最小反射损耗（RL min）在6.2 GHz下达到-41.5 dB，有效吸收带宽（RL <−10 dB）从4.5改善到8.1 GHz（d = 2.2 mm）。球磨4 h后的FeSiCr纳米粒子的RL min在6.9 GHz下为-40.1 dB，略小于球磨6 h后样品的RL min，而有效吸收带宽（RL <−10 dB）来自5.8至9.0 GHz（d = 2.2毫米）。结果表明，改变形状各向异性可以提高FeSiCr纳米粒子的吸收性能。
更新日期：2020-12-04
中文翻译：
通过改变形状各向异性优化FeSiCr纳米粒子的吸收性能
FeSiCr纳米颗粒通过等离子弧放电和球磨工艺制备。球磨后，FeSiCr纳米颗粒的表面积和尺寸变大，并且大多数纳米颗粒变得不均匀。纳米颗粒表面积和尺寸的增加有助于提高导电性，增强金属离子之间的空间电荷极化，并增加FeSiCr纳米颗粒的形状各向异性。纳米粒子的不均匀性降低了活化能（FeSiCr纳米粒子）。因此，复介电常数（）进行了改进，并且阻抗匹配得到了优化。球磨6 h后，FeSiCr纳米颗粒的最小反射损耗（RL min）在6.2 GHz下达到-41.5 dB，有效吸收带宽（RL <−10 dB）从4.5改善到8.1 GHz（d = 2.2 mm）。球磨4 h后的FeSiCr纳米粒子的RL min在6.9 GHz下为-40.1 dB，略小于球磨6 h后样品的RL min，而有效吸收带宽（RL <−10 dB）来自5.8至9.0 GHz（d = 2.2毫米）。结果表明，改变形状各向异性可以提高FeSiCr纳米粒子的吸收性能。
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